A271699 - OEIS

A271699 as a simple table

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	2
6	0
7	1
8	3
9	9
10	0
11	1
12	4
13	14
14	58
15	0
16	1
17	5
18	20
19	90
20	475
21	0
22	1
23	6
24	27
25	131
26	729
27	4666
28	0
29	1
30	7
31	35
32	182
33	1064
34	7070
35	53116
36	0
37	1
38	8
39	44
40	244
41	1494
42	10284
43	79470
44	684762
45	0
46	1
47	9
48	54
49	318
50	2034
51	14478
52	114918
53	1012368
54	9833391

[1,0,1,0,1,2,0,1,3,9,0,1,4,14,58,0,1,5,20,90,475, 0,1,6,27,131,729,4666,0,1,7,35,182,1064,7070, 53116,0,1,8,44,244,1494,10284,79470,684762,0,1,9, 54,318,2034,14478,114918,1012368,9833391]